Vacuum Tube - 6CA7, JJ Electronics

JJ Electronics
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Vacuum Tube - 6CA7, JJ Electronics

Starting at: $16.45
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The JJ Electronic 6CA7 is a true to form reproduction of a classic tube that will work in most EL34 amps. The 6CA7 is often considered the American cousin to the British EL34. Sonically, this tube is closer to a 6L6 than an EL34 but without the sometimes harsh high end of the 6L6. The JJ 6CA7 offers warm highs with punchy articulate mids and tight lows. Wielding even more power than a KT77, this tube is a great choice for people looking for a change in their EL34 amp’s tone or want to push their levels that much further.

Apex Tube Matching
Matched versions of this tube use Apex Matching
Choose burned-in tubes for maximum stability and performance.
RoHS Compliant
Item ID:
JJ Electronics, Apex Matched
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-6CA7-JJ-MP609722127486
Apex Matched QuadT-6CA7-JJ-MQ609722127493
Apex Burned-In Matched PairT-6CA7-JJ-MPB609722148801
Apex Burned-In Matched QuadT-6CA7-JJ-MQB609722148818
Product Measurements
Body Height100 mm
Cathode Current (Ik)≤ 150 mA
Filament Current (If)1.5 A
Filament Voltage (Uf)6.3 V
Grid 2 dissipation (Wg2)≤ 8 W
Grid Voltage 1 (Ug1)≥ -100 V, 32 V typical
Grid Voltage 2 (Ug2)≤ 500 V, 400 V typical
Grid capacitance (cg1)16.5 pF
Grid to Plate Capacitance (ca/g)1 pF
Heater to cathode voltage (Uk/f)≤ 200 V
Internal Resistance (Ri)24 kΩ
Item Diameter38 mm
Item Height115 mm
Plate Capacitance (ca)9 pF
Plate Current (Ia)50 mA
Plate Dissipation (Wa)≤ 25 W
Plate Voltage (Ua)≤ 800 V, 400 V typical
Transconductance (S)9.5 mA/V
Packaging Information
Packaging DimensionsApex Burned-In Matched Pair version4.5 in. × 3.3 in. × 1.8 in.
Apex Burned-In Matched Quad version4.5 in. × 3.3 in. × 3.3 in.
Apex Matched Pair version1.9 in. × 3.3 in. × 4.6 in.
Apex Matched Quad version3.3 in. × 3.3 in. × 4.6 in.
Single version1.6 in. × 1.6 in. × 4.6 in.
Weight (Packaging)Apex Burned-In Matched Pair version0.3 lbs.
Apex Burned-In Matched Quad version0.6 lbs.
Apex Matched Pair version0.3 lbs.
Apex Matched Quad version0.6 lbs.
Single version0.15 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet497.92 KB

Questions and Answers

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Asked by Anonymous on May 7th, 2016.
May 10th, 2016
Staff Member
Top Contributor
I would suggest either this tube or the E34L for maximum headroom. This should help a bit with your early breakup. Additionally, with the tubes I mentioned you can always request the highest PC/TC numbers for least breakup.
August 7th, 2018
From what I've been discovering online, the answer to this largely lies with the preamp section, namely the four (4) 12AX7s. I'm changing these to, inline from the guitar input jack (call it V1) all the way over: V1 = 12AY7, V2 = 12AX7, V3 = 12AX7, V4 = 5157. Hopefully by this coming Friday 07/10, I'll have a smoother, more gradual gain, which it's hoped, translates to a more singing, far less crosscut crunch tone in the overdrive channel.

Product Reviews

5.00 out of 5 based on 2 reviews
- April 18th, 2014
5 out of 5

I just wanted to update my original post. I bought a quad of these JJ 6CA7's for my 50 watt Marshall so I would have a pair on hand when the first pair was used up. I ran the first pair for over two and a half years! One day I noticed a change in the sound; checked the bias and one of the tubes would not give any bias reading at all. Before that they never wavered; sounded great and the bias was always spot on. Two and a half years of life out of power tubes in a Marshall is pretty impressive. I still love these tubes and will be ordering some more now that I finally had to install my backups.

- July 16th, 2011
5 out of 5

I just put a pair of these in my 73 Marshall after a Winged C EL34 gave it up. I love these new 6CA7's! Low end is tight, nice harmonic content when over driven, and a nice, almost Fender-ish sparkle when you back off guitar volume. Played my first gig with these tubes last night, started off with my volume knobs where I used to set them with EL34's and had to turn down after the first song. I think JJ has a winner with these new tubes, and service and shipping from Amplified Parts stellar as always.

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